Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/85-18 | 275/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.07 (941.7) | 34.24 (869.7) | -2.83 (-72) -7.6% |
| Width inches (mm) | 11.22 (285) | 10.83 (275) | -0.39 (-10) -3.5% |
| Circum. inches (mm) | 116.47 (2958.44) | 107.57 (2732.24) | -8.91 (-226.19) -7.6% |
| Sidewall Height inches (mm) | 9.54 (242.25) | 8.12 (206.25) | -1.42 (-36) -14.9% |
| Revolutions per mile (km) | 543.98 (338.02) | 589.02 (366) | 45.03 (27.98) 8.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.47 mph (29.73 km/h) |
| 25 mph (40.23 km/h) | 23.09 mph (37.16 km/h) |
| 30 mph (48.28 km/h) | 27.71 mph (44.59 km/h) |
| 35 mph (56.33 km/h) | 32.32 mph (52.02 km/h) |
| 40 mph (64.37 km/h) | 36.94 mph (59.45 km/h) |
| 45 mph (72.42 km/h) | 41.56 mph (66.88 km/h) |
| 50 mph (80.47 km/h) | 46.18 mph (74.32 km/h) |
| 55 mph (88.51 km/h) | 50.79 mph (81.75 km/h) |
| 60 mph (96.56 km/h) | 55.41 mph (89.18 km/h) |
| 65 mph (104.61 km/h) | 60.03 mph (96.61 km/h) |
| 70 mph (112.65 km/h) | 64.65 mph (104.04 km/h) |
| 75 mph (120.7 km/h) | 69.27 mph (111.47 km/h) |
| 80 mph (128.75 km/h) | 73.88 mph (118.9 km/h) |
| 85 mph (136.79 km/h) | 78.5 mph (126.34 km/h) |
| 90 mph (144.84 km/h) | 83.12 mph (133.77 km/h) |
| 95 mph (152.89 km/h) | 87.74 mph (141.2 km/h) |
| 100 mph (160.93 km/h) | 92.35 mph (148.63 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1499 | 1741 | 1875 | 1958 | 2047 | 2111 | 2181 | 2264 | 2379 | 2494 | 2622 | 2724 | 2909 | 3113 | 3272 | 3374 | 3432 | 3642 | 3936 | 4573 |
Better Fuel Economy Factory Ratios Increased Power
